Planned federal order to halt 'mercy killings' could have broad impact

Will the Reagan administration's soon-to-be-implemented federal regulations regarding the care and sustenance of severely handicapped infants halt so-called mercy killings? Or will these rules tend to inhibit hospital care and possibly even limit the rights of parents and families to accept or reject medical treatment for their children?

Storm clouds are fast gathering over a government order scheduled to take effect March 22 and ostensibly aimed at hospitals and health-care facilities receiving federal funds. Among other things, it requires the posting of warning notices in maternity wards, indicating that ''discriminatory failure to feed and care for handicapped infants . . . is prohibited by federal law.'' Further it provides that a toll-free telephone hot line be listed so those who suspect violations can report their concerns.

The American Hospital Association calls these rules ''simplistic'' answers for a complex situation. Some nurses and health-care groups consider the regulations an affront to their integrity and a sharp slap on the wrist by the federal government. And civil-rights and religious freedom advocates - who so far have not openly challenged the Department of Health and Human Services (HHS) rules - are concerned that they could be broadly interpreted to affect parents' freedom of choice regarding medical care for their youngsters.They could promote further confusion in the already controversial and unresolved debate over ''life support'' systems for those deemed terminally ill.

These regulations will also receive a resounding rap from a presidential commission report, ''Deciding to Forgo Life-Sustaining Treatment.'' The report is scheduled for release March 21, the day before the HHS rule goes into effect.

The President's Commission on the Study of Ethical Problems in Medicine and Biomedical and Behavioral Research will reportedly criticize the administration for using punitive measures - threatened prosecution and cutting off of federal funds - to solve what it says is a highly complicated and delicate problem.